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Optimization of Section Points Locations in Electric Power Distribution Systems: Development of a Method for Improving the Reliability
Mälardalen University, School of Business, Society and Engineering.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Optimal placering av sektioneringspunkter : Utveckling av metod för att förbättra tillförlitligheten (Swedish)
Abstract [en]

The power distribution system is the final link to transfer the electrical energy to the individual customers. It is distributed in a complex technical grid but is associated with the majority of all outages occurring. Improving its reliability is an efficient way to reduce the effects of outages.

A common way of improving the reliability is by designing loop structures containing two connected feeders separated by a section point. The location of the section point will decide how the system structure is connected and its level of reliability. By finding the optimal location, an improved reliability may be accomplished.

This Master’s thesis has developed a method of finding optimized section points locations in a primary distribution system in order to improve its reliability. A case study has been conducted in a part of Mälarenergi Elnät’s distribution system with the objective of developing an algorithm in MATLAB able to generate the optimal section points in the area. An analytical technique together with a method called Failure Modes and Effect Analysis (FMEA) as preparatory step, was used to simulate the impact of outages in various components based on historical data and literature reviews. Quantifying the impact was made by calculating the System Average Interruption Duration Index (SAIDI) and the Expected Cost (ECOST) which represented the reliability from a customer- and a socio-economic perspective.

Using an optimization routine based on a Greedy algorithm an improvement of the reliability was made possible. The result of the case study showed a possible improvement of 28% on SAIDI and 41% on ECOST if optimizing the location of section points. It also indicated that loop structures containing mostly industry-, trade- and service-sectors may improve ECOST considerably by having a relocated section point.

The analysis concluded that based on the considerable improvement the case study showed, a distribution system could be highly benefitted by optimizing the location of section points. The created algorithm may provide a helpful tool well representative for such a process in a cost-effective way. Applying it into a full size system was considered being possible but it would first require some additional improvements of reliability inputs and to resolve some fundamental issues like rated current in lines and geographical distances to substations. 

Place, publisher, year, edition, pages
2015. , 112 p.
Keyword [en]
Primary distribution system, Mälarenergi Elnät, loop structure, radially operated, section point locations, switches, power system reliability, optimization algorithm, analytical technique, FMEA
Keyword [sv]
Mellanspänningsnät, Mälarenergi Elnät, slingnät, radialnät, sektioneringspunkt, frånskiljare, brytare, tillförlitlighet, optimerings algoritm, analytisk teknik, FMEA
National Category
Infrastructure Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering Energy Systems
URN: urn:nbn:se:mdh:diva-30670OAI: diva2:890321
External cooperation
Mälarenergi Elnät AB
Subject / course
Energy Engineering
Available from: 2016-01-08 Created: 2016-01-02 Last updated: 2016-01-08Bibliographically approved

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